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In earlier types of [[client-server]] computing, each application had its own client program which served as its [[user interface]] and had to be separately installed on each user's [[personal computer]]. An upgrade to the server part of the application would typically require an upgrade to the clients installed on each user workstation, adding to the [[technical support|support]] cost and decreasing [[productivity]].
In contrast, Web applications dynamically generate a series of [[Web document]]s in a standard format supported by common browsers such as [[HTML]]/[[XHTML]]. [[Client-side scripting]] in a standard language such as [[JavaScript]] is commonly included to add dynamic elements to the user interface. Generally, each individual Web page is delivered to the client as a static document, but the sequence of pages can provide an interactive experience, as user input is returned through Web [[form]] elements embedded in the page markup. During the session, the Web browser interprets and displays the pages, and acts as the ''universal'' client for any Web application.manoj
==Interface==
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